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jQuery.fn.messagePlugin = function(){
    var selectedObjects = this;
    return {
             saySomething : function(message){
                              $(selectedObjects).each(function(){
                                $(this).html(message);
                              });
                              return selectedObjects; // Preserve the jQuery chainability 
                            },
             anotherAction : function(){
                               //...
                               return selectedObjects;
                             }
           };
}
// Usage:
$('p').messagePlugin().saySomething('I am a Paragraph').css('color', 'red');